The Taiwanese local elections of 2014, commonly known as the nine-in-one elections (), were held on Saturday, 29 November 2014, to elect the Municipal Mayors, Municipal Councilors, Chiefs of indigenous districts in municipalities, Councilors of indigenous districts in municipalities, County Magistrates (City Mayors), County (City) Councilors, Township Chiefs, Township Councilors and chiefs of village (borough) in 6 municipalities and 16 counties (cities). Elected officials would serve a four-year term. Polling stations were open from 08:00 to 16:00 on the election day.
The elections resulted in a substantial defeat for the KMT. The KMT previously held 14 of 22 municipalities and counties, but won only 6 in this election due to widespread public distrust, a de facto vote of no confidence to President Ma's Administration, both politically due to Ma's cross strait relations with the Chinese Communist Party), and economically with respect to social and income inequality. The DPP gained executive control of 7 municipalities and counties from the KMT, while independent Ko Wen-je won the Taipei mayoral election. Premier Jiang Yi-huah resigned after the election, forcing President Ma Ying-jeou to appoint Mao Chi-kuo to replace Jiang. President Ma resigned from his post as Chairperson of the Chinese Nationalist Party (KMT) in the days following the election.
As five elected leaders were incumbent legislators, a subsequent legislative by-election was held in March 2015, in which there were no party swings.